Hirotaka Kashiwagi¹, *Hiroaki Misawa¹, Fuminori Tsuchiya¹, Takahiro Obara¹, Satoshi Masuda², Kazumasa Iwai³ (1.Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University, 2.Institute for Space-Earth Environmental Research, Nagoya University, 3.National Institute of Information and Communications Technology)